Telephone transmitter



Patented oct. 19, 1926.y

UNITED STATES PATENT oFF ICE.

RICHARD C. WINCKEL, OF ROSELLE, NEW JERSEY, ASSIGNOR '10 WESTERNELECTRIC COMPANY, INCORPORATED, NEW YORK, N. Y., A CORPORATION 0F NEWYORK.

TELEPHONE TRANSMITTER.

Application led September 2, 1924. Serial No. 735,274.

mitters, and more speciiically to a carbon button closure for confiningthe carbon granules to the granule chamber.

Prior to this invention, felt washers were used for this purpose. Suchmaterial, however, is open to the objection that due to the heating theelectrodes are subjected to when in use these felt rings develop animalfat which condenses in the button and coats the carbon granules withgrease, thus insulating the carbon granules and preventing the properoperation of the transmitter.

The object of this invention is to provide 'a carbon button 'closurewhich contines the carbon granules 'in a positive manner and which whensubmitted toA heatv is free from the objectionable release of greasymatter, characteristic of the felt washers, heretofore used for carbonclosures in telephone transmitters. j

In accordance with this invention the carbon granules are confined, inthe chamber by avnumber of layers of thin sheet heatresisting insulatingmaterial, these sheets having perforations so that when positioned onthe electrode in which the granule chamber is formed these perforationsregister with the outer' open end of the granule chamber and engage thediaphragm, thereL by positively preventing the escape of the buttonclosuregFig.

granules and at the VSametime forming a yieldable` closure to permit thediaphragm to vibrate properly in response to the voice vibrations.y

The rings are preferably of paper such as is used in electric condensersand are disposed in a fan-like arrangement which permit the diaphragm torespond accurately to its adjusted vibration frequency.

Other features of the invention and ad`- vantages will appear from thefollowing description and by the claims appended thereto, referencebeinghad to the accompanying drawings in which Fig. 1 is a sectionalview of the transmitter embodying the features of this invention; Fig. 2is a plan view .of a paper ring used therein; for the carbon closure,LFig. 3 is a plan view of a transmitter embodying a modified form ofcarbon 4 is a sectional view thereof and Fig. 5 is a 1an view of a paperdisc used in the modifie; form of carbon button closure shown in Figs. 3and 4.

The telephone transmitter in which this Aprovided with a stem inventionis particularly well adapted for use generally consists of a casing 10,in which the bracket 11 is mounted and held secured against the'shoulder portion 9 of the casing by means of a mouthpiece 12, which iscasing. A diaphragm 14, held securely on the front end portion ofbracket 11 by means ofthe mouthpiece -12 contacts with the outermostdisposed ring of a paper pad formed by a plurality of paper rings15which are disposed in a fan-like arrangement on the front portion ofelectrode 16 as shown in Fig. 1. The rings 15 may be made of anywell-known heat resisting material, such as paper of the kind used inelectric condensers. These rings 15 are secured on the electrode 16 bymeans of a metal cap 17 spun pover the periphery of electrode 16.Electrode 16 is c18 which fits into an insulating bushing 19 disposed inthe central portion of bracket 11 and a nut 20 screwed on the threadedend portion of stem 'o I Y screwed on the threaded portion 13 of the" 18is provided for holding an incoming wire- Y .to its adjusted vibrationfrequency, while forming an eiicient closure therebetween.

In the modification of the invention shown in Figs. 3 and 4, the paperdiscs 15 are mounted in the insulating ring 33 and have a plurality ofcircular holes 26, 27, 28, etc., shown in Fig. 5, which register withthe carbon cups 29, 30, 31,-etc., in the electrode 16. The'diaphragm 14cooperates with the paper discs 15 for holding the carbon granules inthe cup to form a yieldable andeiiicient closure between the diaphragmand the electrode 15 .while permitting the vdiaphragm 14 to respondaccurately toits adjusted frequency. A

What is claimed is 1. In a telephone transmitter, an electrode l eachother and with the granular chamber entrancev and mounted on saidelectrode around the entrance to said chamber, and a 4 diaphragmcontacting with the outer sheet and the granules in said chamber.

2. In af telephone transmitter, an electrode having a granule chamber, anumber of rings of heat-resisting insulating material surrounding theentrance to said chamber superimposed on each other and havingperforations which register with each other and with the granularchamber entrance, means attached to the peripheries of said rings andelectrode for binding the edges of the rings to the outer edge of theelectrode, and a diaphragm held in contacting relationwith the free endof the outer ring and with thegranules in said chamber.

3. lIn a telephone transmitter, the combination with an electrode, achamber therein containing conducting granules, a diap phragm disposedin juxtaposition and in a plane parallel to said electrode, and aplurality of paper rings mounted on said electrode and' disposed phragmfor holding the granules in said electrode.

4. In a telephone transmitter, the combination lwith an electrode,

in contact with said diaa chamber in said electrode containing conductingranules, a diaphragm, and paper rings 'sposed in a fan-like arrangementin contact with said diaphragm for holding said granules in position insaid electrodes. f

5. In a telephone transmitter, the combination with a recessedelectrode,l carbon granules therein, a diaphragm disposedv injuxtaposition to said electrode, and a plurality of paper membersdisposed betweenA said diaphragm and said electrode in a manner to forma yieldable closure therebetween for holding said carbon in'saidelectrode and to permit the free movement of said dia-- phragm.

6. In a telephone transmitter, the combination with a circular electrodehaving a cavity in its central portion, granules therein, a plurality ofsuperposed paper rings disposed on the plane surface of said electrodeand concentric with said cavit a metal cap having a flange spun oversaid7 electrode for holding said rings in position, andI a diaphragmcooperatlng ing the carbon granules in said cavity.

In lwitness w ereof, I hereunto subscribe my name this 23rd day ofAugust A. D.,

RICHARD C. WINCKEL.

with the rings for hold-

